MONTREAL (AP) _ Steffi Graf, who dominated women's tennis before injuries proved her downfall, was upset by Spain's Magui Serna 6-4, 6-4 Thursday in the third round of the $1.3-million du Maurier Open.

``I have no consistency in my game at all right now,'' said the dejected Graf, the former world No. 1 who has battled injuries the last two years. ``At the end, I was just trying to get the ball in the court. I had no feel at all.

``It has a lot to do with confidence. I'm not secure with my shots right now. I'm tentative.''

Serna had a match point serving at 5-3 but Graf fought it off, then won her own serve. Graf saved three more match points on Serna's serve before losing after the game had gone to its third deuce.

The end came after Graf hit a backhand just long and Serna fired an ace down the middle.

Serna is ranked No. 26 in the world to No. 41 for Graf, who is attempting a comeback from a knee injury.

Meanwhile, top-seeded Martina Hingis made a lot of errors, but still beat Japan's Ai Sugiyama 6-3, 6-0 to reach the quarterfinals.

``I had a great year last year but it's tough doing it again,'' said Hingis, adding that the problem with being No. 1 is ``you can't get better. There's nothing you can do but try to win.''

Second-seeded Jana Novotna and fifth-seeded Monica Seles also reached the quarterfinals with straight-set victories.

Nathalie Tauziat of France led French Open champion Arantxa Sanchez Vicario of Spain 4-3 in the first set of their evening match, which was delayed more than three hours by rain and then was postponed after 24 minutes of play.

A third-round match between Anna Kournikova of Russia and sixth-seeded Conchita Martinez of Spain didn't get started and the Irena Spirlea-Sandrine Testud match was postponed at 6-6 in the first set.